EP0535155A1 - Libraries of modified peptides with protease resistance - Google Patents
Libraries of modified peptides with protease resistanceInfo
- Publication number
- EP0535155A1 EP0535155A1 EP91913414A EP91913414A EP0535155A1 EP 0535155 A1 EP0535155 A1 EP 0535155A1 EP 91913414 A EP91913414 A EP 91913414A EP 91913414 A EP91913414 A EP 91913414A EP 0535155 A1 EP0535155 A1 EP 0535155A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbon atoms
- mixture
- polymers
- monomers
- amino acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- SLZIZIJTGAYEKK-CIJSCKBQSA-N molport-023-220-247 Chemical compound C([C@@H](C(=O)N[C@@H](C)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC=1N=CNC=1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CO)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC=1N=CNC=1)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(=O)NCC(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C)C(N)=O)NC(=O)[C@H]1N(CCC1)C(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)CNC(=O)[C@H](C)NC(=O)[C@H](CO)NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](NC(=O)[C@H](CC=1C2=CC=CC=C2NC=1)NC(=O)CN)[C@@H](C)O)C1=CNC=N1 SLZIZIJTGAYEKK-CIJSCKBQSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- NKAAEMMYHLFEFN-UHFFFAOYSA-M monosodium tartrate Chemical compound [Na+].OC(=O)C(O)C(O)C([O-])=O NKAAEMMYHLFEFN-UHFFFAOYSA-M 0.000 description 1
- FEMOMIGRRWSMCU-UHFFFAOYSA-N ninhydrin Chemical compound C1=CC=C2C(=O)C(O)(O)C(=O)C2=C1 FEMOMIGRRWSMCU-UHFFFAOYSA-N 0.000 description 1
- URPYMXQQVHTUDU-OFGSCBOVSA-N nucleopeptide y Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(N)=O)NC(=O)[C@H](CC=1NC=NC=1)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)[C@H](CO)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](C)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](C)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](C)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)CNC(=O)[C@H]1N(CCC1)C(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H]1N(CCC1)C(=O)[C@@H](N)CC=1C=CC(O)=CC=1)C1=CC=C(O)C=C1 URPYMXQQVHTUDU-OFGSCBOVSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- XNOPRXBHLZRZKH-DSZYJQQASA-N oxytocin Chemical compound C([C@H]1C(=O)N[C@H](C(N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CSSC[C@H](N)C(=O)N1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CC(C)C)C(=O)NCC(N)=O)=O)[C@@H](C)CC)C1=CC=C(O)C=C1 XNOPRXBHLZRZKH-DSZYJQQASA-N 0.000 description 1
- 229960001723 oxytocin Drugs 0.000 description 1
- RYZUEKXRBSXBRH-CTXORKPYSA-N pancreastatin Chemical compound C([C@H](NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](C)NC(=O)CNC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@H](CCC(O)=O)NC(=O)[C@@H]1CCCN1C(=O)[C@@H]1CCCN1C(=O)[C@H](CCC(N)=O)NC(=O)[C@H](C)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](C)NC(=O)CNC(=O)[C@H]([C@@H](C)O)NC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@H](C)NC(=O)CNC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](NC(=O)[C@H](C)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](C)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](CC=1C2=CC=CC=C2NC=1)NC(=O)CN)CCSC)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C)C(=O)NCC(=O)N[C@@H](C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCC(N)=O)C(=O)NCC(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)NCC(N)=O)C1=CN=CN1 RYZUEKXRBSXBRH-CTXORKPYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000000813 peptide hormone Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 125000005541 phosphonamide group Chemical group 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 201000000317 pneumocystosis Diseases 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001470 polyketone Polymers 0.000 description 1
- 229920006295 polythiol Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000001500 prolyl group Chemical group [H]N1C([H])(C(=O)[*])C([H])([H])C([H])([H])C1([H])[H] 0.000 description 1
- 238000003259 recombinant expression Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000003488 releasing hormone Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007423 screening assay Methods 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 229960002101 secretin Drugs 0.000 description 1
- OWMZNFCDEHGFEP-NFBCVYDUSA-N secretin human Chemical compound C([C@@H](C(=O)N[C@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(O)=O)C(=O)NCC(=O)N[C@@H](C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)NCC(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(N)=O)[C@@H](C)O)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](N)CC=1NC=NC=1)[C@@H](C)O)C1=CC=CC=C1 OWMZNFCDEHGFEP-NFBCVYDUSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- IZTQOLKUZKXIRV-YRVFCXMDSA-N sincalide Chemical compound C([C@@H](C(=O)N[C@@H](CCSC)C(=O)NCC(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(N)=O)NC(=O)[C@@H](N)CC(O)=O)C1=CC=C(OS(O)(=O)=O)C=C1 IZTQOLKUZKXIRV-YRVFCXMDSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 description 1
- 238000011191 terminal modification Methods 0.000 description 1
- MHYGQXWCZAYSLJ-UHFFFAOYSA-N tert-butyl-chloro-diphenylsilane Chemical compound C=1C=CC=CC=1[Si](Cl)(C(C)(C)C)C1=CC=CC=C1 MHYGQXWCZAYSLJ-UHFFFAOYSA-N 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 150000007970 thio esters Chemical class 0.000 description 1
- 150000003556 thioamides Chemical class 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- LCJVIYPJPCBWKS-NXPQJCNCSA-N thymosin Chemical compound SC[C@@H](N)C(=O)N[C@H](CO)C(=O)N[C@H](CC(O)=O)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@H](C(C)C)C(=O)N[C@H](CC(O)=O)C(=O)N[C@H](C(C)C)C(=O)N[C@H](CO)C(=O)N[C@H](CO)C(=O)N[C@H](CCC(O)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@H]([C@H](C)O)C(=O)N[C@H](C(C)C)C(=O)N[C@H](CCCCN)C(=O)N[C@H](CC(O)=O)C(=O)N[C@H](CC(C)C)C(=O)N[C@H](CCCCN)C(=O)N[C@H](CCC(O)=O)C(=O)N[C@H](CCCCN)C(=O)N[C@H](CCCCN)C(=O)N[C@H](CCC(O)=O)C(=O)N[C@H](C(C)C)C(=O)N[C@H](C(C)C)C(=O)N[C@H](CCC(O)=O)C(=O)N[C@H](CCC(O)=O)C(=O)N[C@@H](C)C(=O)N[C@H](CCC(O)=O)C(O)=O LCJVIYPJPCBWKS-NXPQJCNCSA-N 0.000 description 1
- 229960000187 tissue plasminogen activator Drugs 0.000 description 1
- FGMPLJWBKKVCDB-UHFFFAOYSA-N trans-L-hydroxy-proline Natural products ON1CCCC1C(O)=O FGMPLJWBKKVCDB-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- 239000000780 urotensin Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/001—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof by chemical synthesis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
- C07K1/04—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length on carriers
- C07K1/047—Simultaneous synthesis of different peptide species; Peptide libraries
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
- C07K5/02—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link
- C07K5/0207—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link containing the structure -NH-(X)4-C(=0), e.g. 'isosters', replacing two amino acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/02—Linear peptides containing at least one abnormal peptide link
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- This invention relates to the fields of biochemistry and drug design. More particularly, the invention relates to modified peptides, i.e., nonnatural peptides referred to herein as peptoids, methods for preparing and isolating such peptoids wherein
- a large number of small polypeptide hormones, exhibiting potent biological activity, may be synthesized directly using automated peptide synthesizers, solid state resin techniques, and the like.
- Hormones and growth factors such as epidermal growth factor, growth hormone, growth hormone releasing factor, somatostatin, vasopressin, enkephalins, endorphins, bradykinnins, and the like are all small enough to be easily accessible using current technology.
- defined antigenic epitopes may be synthesized as short or medium-length polypeptides for use in vaccines.
- small polypeptides in general enjoy only a short half-life once administered, and are rapidly degraded by endogenous proteases. The therapeutic potential of such polypeptides would be dramatically increased by extension of the in vivo half-life.
- cleavage for example, by replacing the amide with a saturated amine. See, for example, Skiles et al.,
- pp. 969-70 disclosed peptides in which all of the peptide bonds were replaced with saturated amine bonds.
- Lys-Gly dipeptide derivatives for inhibition of angiotensin-converting enzyme, in which the Gly amide nitrogen was substituted with 2,3-dihydro-1H-indene.
- Sempuku et al., JP 58/150,562 (Chem Abs (1984) 100:68019b) disclosed N-substituted glycine derivatives useful for inhibition of angiotensin-converting enzyme. J.D. Young et al., "Proceedings of the 11th American Peptide
- bradykinin in which proline at position 7 was replaced by N-benzylglycine.
- peptides as pharmaceutically active compounds.
- the larger the peptide the more difficult it becomes to produce commercial quantities of the peptide in sufficient purity for use as a pharmaceutically active compound.
- larger peptides are not particularly stable metabolically and are difficult to deliver, especially when the delivery is in convenient forms such as oral delivery systems.
- large peptide molecules are easily broken down by endogenous enzymes.
- the pharmaceutical industry still prefers to employ organic chemicals (i.e., smaller molecules which are not so difficult to synthesize and purify) rather than peptides.
- the number of possible organic molecules capable of interaction with any given receptor is less limited than the number of peptides meeting the same criteria. Further, organic molecules are frequently less susceptible to metabolism than are peptides, and may often be administered orally. However, it is difficult to rationally design an organic molecule for optimal activity and/or binding to a particular site.
- the additions are performed sequentially by deprotecting the N-terminus, adding the next amino acid in protected form, deprotecting the new N-terminus, adding the next protected amino acid, etc.
- C-terminal amino acids bound to supports were placed in individual polyethylene bags, and mixed and matched through the addition cycles, so that twenty bags (each containing a different C-terminal residue bound to a support) can be simultaneously deprotected and treated with the same protected amino acid. In this manner, one can obtain a set of peptides having different sequences simultaneously. The peptides are then
- Rutter et al. PCT WO89/10931, described a method by which one can generate a large number of peptides systematically in approximately equimolar amounts, and assay the resulting library of peptides for biological activity. Rutter also disclosed using amino acids having altered side chains, such as phenylglycine, hydroxyproline, and ⁇ -aminobutyric acid.
- the active peptides are selected from the remainder of the library by a variety of methods, the most straightforward of which is binding to a ligand or receptor. For example, if the target peptide is to be ligand for a receptor, the library of peptides may be applied to a quantity of receptor bound to a solid support. The peptides which bind with highest affinity can then be separated from peptides with lower affinity by standard techniques. This method allows one to probe a binding site with a very large number of peptides.
- composition and containing a peptide of a desired amino acid sequence involves three essential steps. First, a given amount of a mixture of amino acyl or peptide derivatized resin is divided into a number of pools with each pool containing an equal molar amount of the resin mixture. Second, a different single amino acid is coupled to the resin mixture in each of the pools and the coupling reaction is driven to completion. The peptide mixtures in each of the pools are then mixed together to obtain a complex peptide mixture containing each peptide in retrievable and analyzable amounts. The steps can be repeated to lengthen the peptide chains and methods can be employed to retrieve the desired peptide from the mixture and carry out analyses such as the determination of the amino acid sequence. The ability to obtain mixtures with equal molar amounts of each peptide therein is dependent on the ability to accurately weigh and divide each reaction product into equal amounts and the ability to drive each reaction to completion.
- Each of the above-described methods offers a method of producing one or more peptides which may have a desired biological activity. Although some of the methods may mention the use of modified amino acids, all the end products result in conventional peptide bonds.
- the present inventors postulated that there are potential nonpeptide molecules with improved protease resistance and possibly with higher affinity than the natural peptide ligand. Such nonpeptides were further postulated as less susceptible to rapid cleavage and clearance. Additionally, the present inventors
- nonpeptides could be bound to pharmaceutically active organic compounds and provide conjugates which use the nonpeptide portion as
- biochemical targeting agents for the organic molecule bound to it are biochemical targeting agents for the organic molecule bound to it.
- Peptoids and peptoid libraries methods of making such, as well as methods of isolating a bioactive peptoid from a library are disclosed.
- the present invention provides a systematic method for synthesizing and assaying a large number of peptide mimics or peptoids simultaneously.
- the compounds, referred to herein as "peptoids,” may resemble conventional peptides, but contain at least two substitutes for conventional amino acids and/or peptide bonds.
- the entire peptoid consists only of amino acid substitutes, i.e., does not include natural amino acids and more preferably the peptoid is bound to a bioactive compound, such as a pharmaceutically active drug.
- the substitutes may be any molecule suitable for standardized synthesis and incorporation.
- Presently preferred amino acid substitutes are N-alkylated derivatives of glycine, which are easily synthesized and incorporated into polypeptide chains.
- Preferred pharmaceutically active drugs include steroids and AZT.
- Any monomer units which allow for the sequence specific synthesis of pools of diverse molecules are appropriate for use in producing peptoid molecules of the invention and are useful in determining the
- conformational space of a protein The use of nonpeptide polymers have certain advantages. Such molecules occupy different conformational space than a peptide and as such are more resistant to the action of proteases. Further, the side chain groups can be customized for optimal binding to receptors and monomer units can be chosen for convenience of synthesis.
- a primary object of the present invention is to provide a method for producing large numbers or libraries of peptoids which peptoids are polymers comprised exclusively or at least in part of amino acid substitutes.
- Another object of the invention is to provide methodology for screening such peptoid libraries in order to obtain peptoids which mimic to some degree the activity of natural proteins.
- an advantage of the present invention is that the monomer units of the peptoid are not limited to conventional amino acids but may include a variety of amino acid substitutes which can create a variety of three-dimensional confirmations in the resulting peptoid and thereby obtain a desired biological activity.
- a feature of the present invention is that the methodology can be used to synthesize and isolate peptoids with the strongest binding affinity.
- a bioactive compound such as a pharmaceutically active drug
- a feature of the present invention is that the peptoid molecules produced have improved protease resistance as compared with corresponding natural proteins.
- peptoids of the present invention can be designed as to not include the sissile bond in natural proteins which bond is cleaved by natural proteases.
- peptoids and peptoid libraries of the invention can be used to explore receptor interactions, i.e., the interaction between such peptoids and the natural receptor sites.
- Another object of the invention is to provide drug design methodology whereby peptoids are designed which peptides have added protease resistance as compared with peptides and have the same or stronger affinity for natural receptor sites.
- Another feature of the invention is that the chemical synthesis methodology can be used in connection with solid phase polymerization techniques, making it possible to produce defined libraries and the solid phase polymerization techniques can be automated to produce compounds in commercial quantities.
- peptoids of the invention have net only different structures with respect to the bonds they contain as compared to natural peptides, but have different three- dimensional structures which structures may not be possible with conventional peptides.
- the present invention includes a variety of different aspects, including novel peptoids, peptoid libraries, peptoid conjugates, processes for synthesizing such peptoids, libraries and conjugates, and processes for isolating from such libraries peptoids of desired biological activity. Further, within each of these aspects of the invention, the present invention includes a large number of specific embodiments. The essence of the invention involves providing processing technology whereby those skilled in the art can use the information disclosed and described herein in order to produce and isolate molecules which mimic the biological activity of naturally-occurring molecules but which have different chemical structures as compared to the natural molecule.
- peptoid is formed which peptoid can have preferred biological activity as compared to its corresponding peptide which consists only of nature amino acids.
- Amino acid is used in a more restricted sense than any compound which includes NH 2 -R-COOH in its structure. Amino acid means any of the twenty naturally occurring alpha-amino acids.
- a “peptoid” is a polymer made up, at least in part, of monomer units of "amino acid
- substitutes which substitutes are any molecule other than an amino acid but which serves in the peptoid polymer to mimic an amino acid.
- a peptoid of the invention preferably (4) includes 2 to 50 monomer units (more preferably 5 to 10 monomer units; (5) presents a three-dimensional conformation
- the peptoids have the same or greater affinity for natural receptors as do natural peptides; and (6) includes less than 50% of its monomer units as amino acids (more preferably no amino acids).
- Particularly preferred monomer units are N-alkylated derivatives of glycine.
- Peptoids are produced by linking the "amino acid substitutes" into a linear chain with amino acids and/or other amino acid substitutes.
- the links may include, without limitation, peptide bonds, esters, ethers, amines, phosphates, sulfates, sulfites, thioethers, thioesters, and aliphatic bonds.
- Exemplary amino acid substitutes include N-substituted glycine, N-substituted alanine, N-substituted D-alanine,
- substituted hydroxy acids such as hydroxyacetic acid, 2-hydroxypropanoic acid, 3-hydroxypropanoic acid,
- a peptoid may comprise amino acid substitutes using more than one type of link provided the chemistry for the reaction schemes are compatible and encompassed generally by the reactions described herein.
- the phrase "compound of Formula I" refers to a peptide analog having the following structure:
- R is alkyl of 2-6 carbon atoms, haloalkyl of 1-6 carbon atoms where halo is F, Cl, Br, or I, alkenyl of 2-6 carbon atoms, alkynyl of 2-6 carbon atoms, cycloalkyi of 3-8 carbon atoms, aryl of 6-10 carbon atoms, arylalkyl of 7-12 carbon atoms, arylalkyl of 7-12 carbon atoms substituted with 1-3 radicals independently
- indolyl or indolylalkyl of 9-15 carbon atoms
- X n and X c are each independently H, a peptide chain of 1-50 amino acids, or another radical of
- Formula I wherein if X n is H then X c is a chain of at least 2 amino acids or a radical of Formula I, and if X c is H then X n is a chain of at least 1 amino acid or a radical of Formula I; and salts thereof.
- polypeptides comprising N-substituted glycine analogs which resemble naturally-occurring amino acids (i.e., Ala, Cys, Asp, Glu, Glu, Phe, His, lie, Lys, Leu, Met, Asn, Gin, Arg, Ser, Thr, Val, Trp, and Tyr).
- Naturally-occurring amino acids i.e., Ala, Cys, Asp, Glu, Glu, Phe, His, lie, Lys, Leu, Met, Asn, Gin, Arg, Ser, Thr, Val, Trp, and Tyr.
- radicals X n and X c are either chains of conventional amino acids, chains of one or more N-substituted glycine analogs, or chains in which conventional amino acids and N-substituted glycine analogs are interspersed.
- N-substituted glycine analogs are those in which R is ethyl, prop-1-yl,
- prop-2-yl 1-methylprop-1-yl, 2-methylprop-1-yl, benzyl, 4-hydroxybenzy1, 2-hydroxyethy1, mercaptoethy1,
- Serine may be replaced with hydroxymethyl, 2-hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, and the like.
- a conventional amino acid may be replaced with an N-substituted glycine analog having a sidechain of similar character, e.g, hydrophobic, hydrophilic, polar, nonpolar, aromatic, etc.
- a "compound of formula II" has the following structure:
- R is as defined above, and L is a divalent radical equivalent in length to an amino acid.
- the term "monomer” refers to a molecule which may be linked to other monomers to form a peptoid.
- Monomers include amino acid substitutes, which may include N- and/or C-terminal modifications to facilitate linking, for example, leaving or activating groups.
- H-substituted glycine analog refers to compounds of the formula RNH-CH 2 -COOH, where R is as defined above.
- the salts and esters of these compounds, as well as compounds of the formula bearing standard protecting groups e.g., Fmoc, t-Boc, and the like
- polypeptides also referred to as proteins, constructed only from the naturally-occurring amino acids: Ala, Cys, Asp, Glu, Glu, Phe, Gly, His, lie, Lys, Leu, Met, Asn, Pro, Gin, Arg, Ser, Thr, Val, Trp, and Tyr.
- a compound of the invention "corresponds" to a natural peptide if it elicits a biological activity related to the biological activity of the natural protein.
- the elicited activity may be the same as, greater than or less than that of the natural protein, i.e., provide enhanced and/or blocking effects. In general, such a peptoid will have an
- Illb Gly-Gly-Phe*-Met-Ser*-Ser-Glu-Lys*-Ser-Gln- Ser*-Pro-Leu-Val*-Thr
- Val* refers to N-(prop-2-yl)glycine
- Phe* refers to N-benzylglycine
- Ser* refers to
- N-(2-hydroxyethyl) glycine may substitute for Ser, Thr, Cys, and Met; N-(2-methylprop-1-yl) glycine may substitute for Val, Leu, and lie.
- Ser* is used to substitute for Thr and Ser, despite the structural differences: the sidechain in
- Ser* is one methylene group longer than that of Ser, and differs from Thr in the site of hydroxy-substitution.
- Ser* is one methylene group longer than that of Ser, and differs from Thr in the site of hydroxy-substitution.
- N-benzyl- or N-aralkyl-substituted glycine to replace any aromatic amino acid (e.g., Phe, Trp, etc.)
- an N-alkyl-substituted glycine such as N-butylglycine to replace any nonpolar amino acid (e.g., Leu, Val, lie, etc.)
- an N-(aminoalkyl) glycine derivative to replace any basic polar amino acid (e.g., Lys and Arg).
- conjugate is a peptoid of the invention bound covalently to a pharmaceutically active drug or drugs.
- the peptoid may be synthesized for an affinity to a particular bacterial and then bound to an antibacterial agent such as trimethoprim.
- a peptoid is a modified peptide with affinity for some receptor of the AIDS virus which peptoid is bound to AZT.
- the peptoid portion of the conjugate is designed to resist degradation while having a high affinity for a particular receptor.
- the peptoid provides for a biochemical, targeting or delivery system for the drug it is bound to. Libraries of peptoids are screened for their affinity to a desired target and when the peptoid with the highest affinity is found it is bound to a drug to form a conjugate.
- effector compound includes any compound which binds to a biological receptor site and effects a biochemical event after so binding.
- effector compound includes pharmaceutical drug as well as insecticides, but is not limited to either.
- the monomer units which will make up the peptoids.
- These monomer units may include conventional amino acids but more preferably include substitute amino acids. The details of such substituted amino acids are described further below.
- the monomer units of the invention are provided the units are linked together to provide polymers, which polymers include at least some substitute amino acids and thus are peptoids.
- An important aspect of the present invention is that the monomer units are combined with each other in such a manner so as to provide a library of peptoids each with different amino acid sequences. This library of peptoids is produced in a single reaction vessel which can then be screened in order to extract a peptoid of desired biological
- substitute amino acids to the chain to produce a peptoid.
- Monomers such as amino acids and substitute amino acids are first protected and then linked into a polymer chain using any suitable coupling technique.
- the monomer units such as the substitute amino acids may be first protected and then reacted with the unprotected reaction site of a chain using solid-phase synthetic techniques after the chain has been immobilized on a resin.
- peptoids wherein each different peptide (or peptoid) is present in the mixture in substantially equally molar amounts and/or in predictable and retrievable amounts.
- the methodology involves preparing libraries or large mixtures of peptides.
- this methodology allows for the production of libraries of peptoids.
- applicant's method involves preparing mixtures of distinct, unique and different peptoids in the same reaction vessel. That is, the peptides within the reaction vessel are different from one another and each of the peptides in the reaction vessel is present in retrievable and analyzable amounts. The method is carried out by combining and reacting activated monomer units such as activated amino acids or activated
- the activated monomer units are provided in concentrations relative to each other based on their relative coupling, constants.
- the coupling constants for conventional amino acids are known and by using techniques described in the literature and
- W089/10931 can be calculated for any given substitute amino acids.
- the resulting mixture of peptoids will contain each reaction product or peptoid in a predictable and defined amount and in an amount sufficient such that the peptoids can be retrieved and analyzed.
- the resulting amounts of each of the peptoids is predictable in that the reaction rate constants are known and the reactants are being added with each other based on the reaction rate
- the length of the peptoid chain can be continually increased by repeating this procedure time and time again, wherein each time the mixture of
- activated monomer units is added, and reacted with the acceptor monomer units or peptide in amounts based on the reaction rate constants of the activated monomer units.
- individual peptoids are produced using methodology such as solid-phase synthetic techniques after immobilizing one terminal monomer unit on a resin.
- the techniques are carried out in order to produce novel peptoids which include substituted amino acids.
- the peptoids have improved metabolic stability.
- substituted amino acids may include side-chains which may include active reaction sites or which may be modified to include reaction sites, that is, acceptor sites. These acceptor sites can then be covalently bound to other molecules such as pharmaceutically active compounds to form conjugates.
- the peptoids of the invention can be used as chemical delivery systems.
- the conjugate When the conjugate is administered, the peptoid will bind to a specific receptor site and the pharmaceutically-active compound bound to the peptoid will be delivered to the desired site.
- conjugates of the invention include peptoid units wherein one or more of the substituted amino acids within the peptoid has a pharmaceutically active compound attached thereto.
- peptoids of the invention can be produced using amino acids as the monomer units or amino acid substitutes. Examples of different modifications in amino acids which can be carried out in order to obtain the amino acid substitutes used in the invention are put forth below in Table 1.
- the individual monomer units or substitute peptides such as those described below can be combined together in any manner. However, it is most preferable to combine the monomer units using methodology such as disclosed within published PCT application WO89/10931 in order to obtain large libraries of different peptoids, which libraries can then be screened to find one or more peptoids which has a particular characteristic such as a high affinity for a particular receptor site.
- the substitute amino acids put forth below are examples of preferred substitute amino acids which can be used in connection with producing peptoids of the invention, it should be noted that any monomer unit can be used which would allow for sequence specific synthesis of pools of diverse molecules.
- Any such monomer unit would be suitable for use in connection with the present invention in that such units would make it possible to search and screen for particular conformational shapes which have affinity for particular receptor sites.
- the use of nonpeptide polymers is believed to have particular advantages over conventional peptides in that such peptoids would occupy different conformational
- substitute amino acids could be designed so as to provide for molecules which are generally easier to synthesize than conventional peptides might be.
- N-alkylated glycines The main advantages of this system are the ease of synthesis of the properly protected achiral monomers and the vast literature of peptides concerning the synthesis and characterization of the closely related peptide polymers. The main
- N-alkylated glycines are a preferred class of N-substituted glycines which can be used in connection with the present invention.
- substitutions may be made on the nineteen other natural amino acids.
- Polyesters are one of the closest relatives to the normal peptide bonds. The advantage is the close similarity, however, this can also be a drawback since proteolytic enzymes are known to recognize esters or even prefer esters as their
- ⁇ -Polyesters are prepared from chiral ⁇ -hydroxy acids in which there has been considerable synthetic interest (Chan, P.C., et al., Tetrahedron Lett (1990) H:1985). In a stepwise fashion, polymers can be assembled much as polyamides are prepared.
- N-hydroxy amino acids The advantages are the decreased sensitivity to enzyme hydrolysis and H-bonding ability due to the added hydroxyl group. Kolasa et al. has described the synthesis of N-hydroxypeptides (Kolasa, T., et al, Tetrahedron (1977) 33:3285). VI. ß-POLYESTER
- ß-Ester This is an example of a homologue of the ⁇ -ester. Presumably the different spacing will confer some special properties such as increased resistance to enzyme hydrolysis or novel conformational flexibility.
- the appropriate starting materials are readily synthesized (Elliott, J., et al., Tetrahedron Lett (1985) 26:2535, and Tetrahedron Lett (1974) 15:1333.
- Sulfonamides The two sulfonamides differ by the positioning of the R group. According to Frankel and Moses (Frankel, M., et al.,
- Ureas are also conveniently synthesized from carboxylic acids and amines using the reagent diphenylphosphoryl azide, DPPA (Shiori, T., et al., J Am Chem Soc (1972) 94:6203, and Bartlett, P., et al., Synthesis (1989) 542). Previously prepared peptides with a single urea replacement had properties similar to the starting peptide (see -reference 1, p. 231).
- solubility properties may be better than for N-alkylated glycines.
- the polymers could be prepared via simple chemistry.
- polyethers would be less suitable for our purposes due to either difficulty in synthesis or predictably poor properties (e.g., polyamines would carry a positive charge at every junction and require double amine
- the ⁇ -polyester structures can be prepared by using chemical synthesis technology known to those skilled in the art. For details of the reaction, see Brewster, P., et al.. Nature, (1990) 166:179.
- Polythioamide structures such as those shown below can be synthesized using techniques such as those described within Clausen, K., et al., J. Chem. Soc.
- N-hydroxy amino acids which can be used in a peptide synthesis.
- ß-polyesters can be synthesized using a synthesis protocol as outlined below.
- a synthesis protocol as outlined below.
- Polysulfonamides can be synthesized using the reaction scheme shown below.
- the chiral ß-amino acids have been described within Kokotos, G., Synthesis (1990) 299, incorporated herein by reference.
- Polyureas can be synthesized using techniques such as those described within Shiori, T., et al., J. Am. Chem. Soc. (1972) 94:6302, and Scholtz, J., and Bartlett, P., Synthesis (1989) 542, both of which publications are incorporated herein by reference.
- Polyurethanes can be synthesized using the reaction scheme put forth below.
- N-substituted glycine analogs are known in the art, and may be prepared by known methods. See, for example, Sempuku et al., JP 58/150,562 (Chem Abs (1984) 100:68019b); Richard et al., U.S. Patent
- N-substituted glycine derivatives are available from commercial sources. For example,
- N-benzylglycine is available from Aldrich Chemical Co. (Milwaukee, WI) as the ethyl ester.
- the ester is
- N-substituted glycine analogs are synthesized by simple chemical procedures.
- N-isobutylglycine may be prepared by reacting excess 2-methylpropylamine with a haloacetic acid.
- N-(2-aminoethyl) glycine may be prepared by reacting excess 1,2-diaminoethane with a haloacetic acid and purifying on Dowex-1 ® (OH form), eluting with acetic acid.
- the unprotected amine is protected with t-butoxycarbonyl (t-Boc) using conventional techniques at
- N-(2-hydroxyethyl) glycine may be prepared by reacting excess 2-aminoethanol with haloacetic acid and purifying on Dowex-1 ® (OH form), eluting with acetic acid. The amine nitrogen is then protected with Fmoc. Next, the acid group is esterified with methanol under acidic conditions. The methyl ester is then treated with isobutylene to form the t-butyl ether. Then, the methyl ester is hydrolyzed using porcine liver esterase in phosphate buffer at pH 8.0, to provide a protected N-substituted glycine analog in a form suitable for peptide synthesis. As an alternative to the above, the Fmoc-hydroxyethylglycine is treated with t-butyldiphenylsilylchloride in DMF and imidazole to give a silyl-protected alcohol.
- N-(carboxymethyl) glycine may be prepared by reacting glycine t-butyl ester with 2-haloacetate in aqueous solution. The product may be protected directly by addition of Fmoc.
- the N- (carboxymethyl) glycine may be prepared by mixing glycine t-butyl ester, glyoxylic acid and palladium on charcoal under an atmosphere of hydrogen in water at pH 6. The compound is then treated with FMOC in the usual manner.
- an Fmoc-protected monomer (N-substituted glycine or conventional amino acid) may be immobilized on a suitable resin (e.g., HMP) by reaction with benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate ("BOP") or a carbodiimide (for example, dicyclohexylcarbodiimide) under basic conditions (e.g., pH > 9) in a suitable solvent.
- BOP benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate
- a carbodiimide for example, dicyclohexylcarbodiimide
- the Fmoc protecting group is removed by treatment with piperidine.
- Each additional monomer is then attached sequentially using BOP or a carbodiimide, until the entire sequence has been constructed.
- the completed chain is then detached from the resin and the
- N-substituted glycine analogs may be connected to the ends of peptides produced by other methods, for example, by recombinant expression or isolation from natural sources.
- N-substituted glycine analogs may be inserted within the sequence of such peptides by cleaving the peptide at the desired position, attaching an N-substituted glycine analog, and reattaching the remainder of the molecule or a
- the peptides of the invention will have at least one monomer, preferably at least two, and more preferably three or more. If there is only one monomer, it is preferred that the analog not be N-benzylglycine.
- the monomers of the invention one may construct peptides containing only N-substituted glycine analogs or other monomers. By varying the sidechains (e.g., by extending or shortening a methylene chain), one can obtain a family of peptide analogs useful for probing the binding interactions between particular peptides and proteins, for example, the interaction between peptide growth factors and their receptors.
- Peptides suitable for modelling according to the invention include adrenocorticotropic hormone, angiotensin I-III, bradykinins, dynorphins, endorphins, enkephalins, gastrin and gastrin-related peptides, bombesins, cholecystokinins, galanin, gastric inhibitory peptides, gastrin-releasing peptide, motilin, neuropeptide Y, pancreastatin, secretin, vasoactive intestinal peptide, growth hormone, growth hormone releasing factor (GRF), luteinizing hormone releasing hormone (LHRH), melanocyte stimulating hormones (MSH), neurotensins, nerve growth factor (NGF), oxytocin, vasopressin,
- somatostatin substance P
- atrial natriuretic peptide ABP
- corticotropin releasing factors epidermal growth factor
- insulin thymosin
- calcitonin urotensin
- urotensin urotensin
- suitable peptides include fragments of larger proteins, such as tissue plasminogen activator
- tPA erythropoietin
- EPO erythropoietin
- antigenic epitopes derived from infectious organisms for example, peptides derived from malarial circumsporozoite antigens or chlamydia major outer membrane protein antigens.
- the peptides of the invention need not be patterned directly on any known peptide, but may be constructed "at random” and tested in general screening assays for any serendipitous biological activity.
- any peptide having at least 3 amino acids, preferably 4 or more, and most preferably 6 or more amino acids will benefit from the method of the invention.
- peptide size there is no theoretical upper limit to the peptide size; however, it is presently preferred to select peptides having no more than 500 amino acids, preferably 200 or fewer, more preferably 100 or fewer, and most preferably about 10 to about 50.
- a library of peptoids having a variety of sequences.
- synthesis of a collection of peptoids using nonconventional amino acids one may prepare a large group of compounds for screening. For example, one may prepare a library of N-substituted glycine derivatives modelled on a known peptide for analysis of its receptor binding site. If a known peptide has, for example, the sequence Phe-Ala-Ser-Ser (FASS), one could prepare a library of peptoids having the following sequences:
- N-(2-phenylethyl)glycine N-methylglycine, N-(2-hydroxyethyl)glycine, N-(2-hydroxyethyl)- glycine;
- N-(1-phenylethyl)glycine N-methylglycine, N-(3-hydroxypropyl)glycine, N-(2-hydroxyethyl) glycine;
- N-(3-(3-methylphenyl)propyl)glycine N-ethylglycine, N-(2-hydroxyethyl)glycine, N-(3-hydroxypropyl)glycine; etc.
- the library may be larger or smaller. This library would be useful for identifying peptoid analogs to the FASS peptide which bind with equivalent or higher (or lower, if desired) affinity to the FASS peptide's receptor. For example, if the hypothetical peptide bound to a known cell-surface receptor, one could plate a culture of the appropriate cells, apply the library under conditions conducive to binding, and allow binding to occur.
- Nonbinding peptoids in the library are removed by washing. If a large number of peptoids exhibit high binding affinity, the binding conditions may be altered so that only the highest affinity peptoids remain bound. The resulting selected peptoids may then be identified by standard analytical techniques. Similarly, if the receptor has been isolated in active form, it may be fixed to a solid support and used to separate the
- peptoids identified should be superior to the native peptide both in its activity and in its bioavailability (as incorporation of nonpeptide bonds reduces
- sequence of the native peptide is unknown, for example, where only a supernatant factor having a give activity has been identified, one may still employ the method of the invention by simply constructing a larger library. Absent clues as to the structural configuration of the peptide or epitope, a "universal" library having a large range of sequence variations is most useful.
- the resulting mixture includes a large number of different peptoids with each peptoid being present in a
- the peptoids within the mixture are covalently bound to a given pharmaceutically active drug.
- the conjugates can then be tested for their affinity to a receptor site. After determining which conjugate has the strongest affinity for the particular receptor site, that conjugate is then individually synthesized.
- a mixture of peptoids is synthesized and the individual peptoids within the mixture are covalently bound to the drug trimethoprim.
- Trimethoprim is a potent inhibitor of bacterial dihydrofolate reductases. Accordingly, trimethoprim is used as an anti-infective agent.
- Trimethopifim includes three methoxy groups which can be substituted with a variety of groups and still retain activity as a dihydrofolate reductase inhibitor.
- trimethoprim is a particularly adaptable drug for use in connection with the present invention.
- the substitution pattern of trimethoprim determines specificity, and the groups must be ethers.
- a random screen can be performed with the selection criteria determined by the specificity one wishes to obtain, thereby optimizing a ligand with known activity.
- mixtures can be used to screen for drugs of enhanced selectivity for a particular dihydrofolate reductase.
- the particular chemistry of forming a conjugate between a peptoid and trimethoprim is carried out by first forming the peptoid mixture. Thereafter, the process involves derivatizing the N-terminus of the peptoids within the mixture with the appropriately activated drug through an amid linkage.
- the reaction is shown as follows:
- trimethoprim drug and the conjugate which might be formed with a peptoid of the invention is shown below:
- N-benzylglycine ethyl ester (Aldrich, 4.0 mL, 20.9 mmol) was dissolved in methanol (40 mL) and treated overnight with aqueous KOH (10 M, 8 mL) at room
- N-benzylglycine.HCI (1.07 g, 5.3 mmol) was dissolved in aqueous acetonitrile, and the pH brought to 9-10 with 1 N NaOH.
- a solution of FM0C-C1 in acetonitrile was added dropwise, and the pH maintained by adding base, until the reaction was complete (as judged by TLC) .
- the pH of the solution was lowered to 4 , and the solution extracted with ethyl acetate. The organic layer was washed with water and dried over sodium sulfate.
- N-isobutylglycine.HCI (1.25 g, 7,46 mmol) was dissolved in aqueous acetonitrile and treated with
- Ethylenediamine (65 mL, 0.97 mol) was cooled in an ice bath, and chloroacetic acid (10.0 g, 0.106 mol) added in small portions, allowing each portion to dissolve. After the addition was complete, the solution was allowed to stir overnight at room temperature. Water was added and the solution applied to a Dowex ® -AG-l column (OH- form, 2.5 X 50 cm). The column was washed with water (2 L) until ninhydrin-negative, and the product eiuted with 0.5 N HOAc. The ninhydrin-positive fractions were pooled, concentrated, and recrystallized from EtOH/Et 2 O/HCl to provide N-2-aminoethylglycine-HCl (9.7 g, 48%).
- N-2-aminoethylglycine-HCl (2.5 g, 13.1 mmol) was dissolved in water (20 mL) and dioxane (25 mL). The pH was brought to 11.2 with concentrated NaOH. BOC-nitrophenylcarbonate (3.5 g, 14.6 mmol) was dissolved in dioxane (20 mL) and added over 45 min with stirring, maintaining the pH with a pH stat. After the addition, the solution was stirred for one day at constant pH.
- the product was used without further purification.
- the pH of the solution was adjusted to 9.5 with NaOH, providing a total volume of about 200 mL.
- Acetone 50 mL was then added, and FMOC-N-hydroxysuccinimide (4.64 g, 13.6 mmol) in acetone (100 mL) added dropwise while maintaining the pH.
- the reaction mixture was stirred overnight.
- the basic solution was extracted with ether and carefully acidified to pH 2.5 with HCI and KHSO 4 .
- the acidic solution was washed with saturated NaCl and dried over sodium sulfate.
- N-2 (hydroxyethyl) glycine (5.18 g, 28.9 mmol) was dissolved in 1 N NaOH (60 mL) and dioxane (60 mL). The pH was adjusted to 9.5 and the solution cooled in an ice bath. FMOC-Cl (10.0 g, 38.7 mmol) in dioxane (50 mL) was added dropwise with stirring while maintaining the pH by addition of NaOH. After the addition was complete, the solution was allowed to stir at room temperature for two more hours. The basic solution was extracted with ether. Then, the solution was carefully acidified to pH 2.5 with HCI, and the acidic solution extracted with
- the product (805 mg, 2.36 mmol) was dissolveed in MeOH and the solution acidified with a few drops of H 2 SO 4 . The solution was heated at reflux for 30 minutes. until TLC indicated a complete conversion to product. Water was added, and the solution extracted with ether, ethyl acetate, and methylene chloride. The ether and ethyl acetate solutions were combined and washed with water and brine, and dried over sodium sulfate. The methylene chloride extract was washed with water and dried. The combined organic layers were concentrated to 880 mg of product, which was used without further purification. This product was dissolved in methylene chloride (11 mL) and cooled in a dry ice bath.
- the desired product (521 mg, 1.27 mmol) was suspended in 0.1 M sodium phosphate (pH 8.0). Porcine liver esterase (100 ⁇ L, 108.5 u/mg, 10 mg/mL) was added followed by Triton® (200 ⁇ L, 10% aqueous solution). The pH was maintained at 8 by periodic addition of NaOH.
- the pH of the solution was adjusted to 9.5, and acetone (100 mL) added.
- a solution of FMOC-NHS (4.0 g, 11.9 mmol) in acetone (50 mL) was added slowly and the pH maintained at 9.5.
- the basic solution was extracted with ether, cooled in an ice bath, and carefully acidified to pH 2.5 with KHSO 4 .
- the acidic solution was extracted with ethyl acetate. The organic layer was washed with water and dried over sodium
- FMOC-N-carboxymethyl(t- butyl ester) glycine (3.07 g, 64% from chloroacetic acid) was obtained as an oil.
- This monomer may be used in peptides at any position at which an acidic side chain is desired.
- Di- and tri-peptides containing 1-3 N-substituted glycine analogs of the invention were prepared using the N-substituted amino acids FMOC-N-isobutylglycine (Leu*) and FMOC-N-benzylglycine (Phe*) .
- the amino acids were loaded onto a Wang resin (S.-S. Wang, J Am Chem Soc (1973) 9_5:1328) and coupled using benzotriazoyloxy-tris(dimethylamino)phosphonium hexafluorophosphate (BOP) and diisopropylethylamine (DIEA).
- Substitution levels were determined using standard analytical procedures by quantifying the amount of FMOC released by treatment with piperidine in DMF. These resins are routinely capped with benzoyl chloride/ pyridine prior to further coupling reactions.
- HPLC analysis was performed using a HewlettPackard Diode-Array 1090 Liquid Chromatograph, using a 2% gradient of 0-100% acetonitrile (0.1% trifluoroacetic acid)/H 2 O (0.1% TFA) over 50 minutes, with an initial 5 min delay (flow rate 0.8 mL/min).
- the column used was a 40 mm X25 cm Vydac ® C-18 stainless steel column.
- IR spectra were obtained using a Nicolet FT-IR. FMOC-amino acids, loaded resin, and BOP were obtained from Advanced Chemtech.
- FMOC-Phe*-Wang resin (63 mg, 0.43 mmol/g) was deprotected by initial washing with 20% piperidine in DMF, followed by treatment for 20 min. After repeatedly washing with DMF, MeOH, and CH 2 Cl 2 , the resin was treated with FMOC-Leu*-Cl (30 mg, -0.08 mmol) in CH 2 Cl 2 (380 ⁇ L) . Pyridine (110 ⁇ L, 1.4 mmol) was added, and the resin shaken for 4 hours. Monitoring the coupling (A. Grandas et al., Int J Peptide Protein Res (1989) 33:386-90) revealed that the reaction was complete within 20 min. Filtration and washing with CH 2 Cl 2 and MeOH provided the fully coupled resin FMOC-Leu*-Phe*-Wang.
- FMOC-Leu*-Leu-Wang FMOC-Phe*-Phe*-Wang; FMOC-Gly-Leu*-Wang; FMOC-Leu*-Phe-Wang;
- Resin Deprotection The resin was treated with a 20% piperidine in DMF solution for one minute, drained, and repeated for 20 m. After draining, the resin was washed with DMF 3 times and methylene chloride 5-7 times.
- Substitution Level A preweighed dried amount of resin is treated with a solution of 20% piperidine in DMF (300 ⁇ -l mL) in an eppendorf tube on a vortexer.
- the tubes are centrifuged for a few minutes to settle the resin. An aliquot is removed (50 ⁇ ) and diluted to 1 mL with acetonitrile. The absorbance at 300 nm is recorded vs. a standard of the same dilution pip/DMF in ACN. In general, the spectrum from 280-320 nm is taken to ensure the characteristic pattern for an FMOC derived product.
- the acyl halide was dissolved in an appropriate amount of methylene chloride and was added to the deprotected resin, followed by a solution of
- PyBroP chemistry The resin ( 100 mg, 0.05 mmol), after deprotection, was washed well (5-10 times) with methylene chloride. A 0.2 mmol aliquot of the amino acid was weighted into a vial. This was dissolved in 1.0 mL methylene chloride and 0.1 mL DIEA. A 0.2 mmol aliquot of PyBroP (bromo-tris-pyrrolidino-phosphonium hexafluoro-phosphate), purchased from Nova chemicals UK, was weighted into another vial. It was also dissolved in 1.0 mL methylene chloride, however, this solution
- the amino acid solution was added to the resin followed by the PyBroP solution. The minicolumn was capped, vented, and gently shaken for one hour. The resin was drained, washed well with methylene chloride and ready for a repeat coupling or capping.
- DIC/HOBt chemistry The resin ("50 mg, 0.033 mmol), after deprotection, was washed well (5-10 times) with DMF. To the resin was added 440 ⁇ of DMF followed by 170 ⁇ of a IM solution of amino acid in DMF and 170 ⁇ of a IM solution of DIC and HOBt in DMF. The mini-column was capped, vented, and gently shaken for one hour. The resin was drained, washed well with methylene chloride and ready for a repeat coupling or capping.
- Polymers using WANG Resin Polymers prepared using the WANG or RINK resins were cleaved using the standard protocol, i.e., 95% aqueous TFA for one hour at room temperature. No scavengers were necessary (no Trp, Tyr, Met). The TFA solution was filtered, dried down, and resuspended in 20% aqueous acetic acid for HPLC analysis.
- a peptide 6mer of the sequence FMOC-LDFSKG-OH was prepared by conventional methods.
- the corresponding peptoid, FMOC-L*D*F*S*K*G-OH was prepared by the pybrop method listed above. Both compounds were purified to homogeneity by HPLC.
- chymotrypsin had at least two cleavage sites, one
- Control 100 100 ⁇ 100
- Peptoids and peptides were prepared on the pins and tested under standard conditions. The assay is best interpreted qualitatively, and the chart below gives a summary of data from three antisera tested. They are representative for the twelve sera which gave signals with both the peptoids and peptides. A 'P' represents a peptide sequence which gave the highest 6-8 signals.
- a '*' represents a peptoid sequence which scored in the top 6-10.
- 33/120 sequences are represented which lends support to the premise that there is selective binding shown by the antibody.
- a peptoid library may be prepared by immobilizing a set of peptoid monomers on an appropriate resin, dividing each batch of resin into a number of reaction mixtures equal to the number of different monomers to be added next, and addition of the monomers (one monomer to each "simultaneous" reaction mixture).
- the reaction products are then pooled, and again divided evenly into a number of reaction mixtures equal to the number of different monomers to be added in the third position, and the addition repeated.
- the cycle of separation into pools, addition of the next monomers, and recombination of some or all of the pools is repeated until polymers of the desired length are obtained.
- the result is a mixture of polymers of equal length, having every possible sequence of monomers represented in essentially equal amounts.
- a length of 2-8 monomers is preferred for this type of application. Provided each reaction is driven to completion, prior to mixing
- the final mixture will include each polymer in substantially equal molar amounts. Adjustments in weight amounts may be made to affect the amount of any polymer in the final product such that each polymer is not present in equal molar amounts but in different amounts, but in retrievable and analyzable amounts.
- N2 or N3 dimers or trimers where N is the number of different monomers employed.
- a synthesis using 6 different monomers would provide 36 dimers, or 216 trimers.
- These oligomers could be assayed individually, or pooled into, e.g., pools of 6 polymers to form 6 pools of dimers or 36 pools of trimers followed by assay.
- the compound 2,4-diamino-5-[3,5-di-methoxy-4- (3-hydrocarboxy-1-oxopropylamino) benzyl]pyrimidine is an effector molecule which exhibits inhibitory acttvity speciific for the enzyme dihydrofolate reductase (DHFR) found in Pneumocystis carinii (the etiologic agent of pneumocystis carinii pneumonia, a leading cause of mortality in AIDS patients).
- DHFR dihydrofolate reductase
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US53833990A | 1990-06-14 | 1990-06-14 | |
US71582391A | 1991-06-14 | 1991-06-14 | |
PCT/US1991/004282 WO1991019735A1 (en) | 1990-06-14 | 1991-06-14 | Libraries of modified peptides with protease resistance |
US538339 | 1995-10-03 |
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- 1991-06-14 DK DK91913414T patent/DK0535155T3/en active
- 1991-06-14 PT PT97992A patent/PT97992B/en not_active IP Right Cessation
- 1991-06-14 EP EP91913414A patent/EP0535155B1/en not_active Expired - Lifetime
-
1995
- 1995-09-29 AU AU32964/95A patent/AU683184B2/en not_active Expired
Patent Citations (6)
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SU158064A1 (en) * | ||||
US4496542A (en) * | 1981-03-30 | 1985-01-29 | Usv Pharmaceutical Corporation | N-substituted-amido-amino acids |
US4536395A (en) * | 1982-01-23 | 1985-08-20 | Ajinomoto Co., Inc. | Amino acid derivatives and antihypertensive drugs containing them |
US4746490A (en) * | 1983-09-22 | 1988-05-24 | Saneii Hossain H | Solid phase peptide synthesizer |
US4631211A (en) * | 1985-03-25 | 1986-12-23 | Scripps Clinic & Research Foundation | Means for sequential solid phase organic synthesis and methods using the same |
WO1989010931A1 (en) * | 1988-05-02 | 1989-11-16 | The Regents Of The University Of California | A general method for producing and selecting peptides with specific properties |
Non-Patent Citations (3)
Title |
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A.F. Spatola 'Peptide Backbone Modifications: A Structure-Activity Analysis of Peptides Containing Amide Bond Surrogates ... * |
J.D. Young and A.R. Mitchell ' Use of N- benzylglycine as a replacement for aromatic amino acid residues. Synthesis of ÄN-benzylglycine7Ü-bradykinin, * |
See also references of WO9119735A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1991019735A1 (en) | 1991-12-26 |
DK0535155T3 (en) | 2002-02-25 |
AU3296495A (en) | 1996-03-07 |
ES2167311T3 (en) | 2002-05-16 |
PT97992B (en) | 1998-11-30 |
DE69132914D1 (en) | 2002-03-14 |
EP0535155B1 (en) | 2002-01-30 |
DE69132914T2 (en) | 2002-09-19 |
IE66205B1 (en) | 1995-12-13 |
ATE212641T1 (en) | 2002-02-15 |
IE912021A1 (en) | 1991-12-18 |
AU8286891A (en) | 1992-01-07 |
JPH06504758A (en) | 1994-06-02 |
EP0535155A4 (en) | 1994-08-17 |
AU683184B2 (en) | 1997-10-30 |
CA2085118A1 (en) | 1991-12-15 |
PT97992A (en) | 1992-04-30 |
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